直接写出得数．
48+35= 7.5﹣5=
×
=
﹣
=﹣
=
÷
=
﹣
+
=
÷2÷= 25×26×4=
142+54= 320+145= 640﹣238= 0×18= 30×4=
50×6=
+
=
﹣
=
+
= 1﹣
=
直接写出得数：
830﹣50= 370+60= 40×6= 300×5= 25×4=
18÷2=
+
=
+
=
﹣
= 1﹣
=
直接写出得数．
21+17= 78﹣15= 200+3000= 4500﹣500=
24×2= 40×3= 35×2= 20×6=
36÷3= 48÷4= 27÷9= 80÷4=
+
=
﹣
=
+
= 1﹣
=
口算．
81+18=
1﹣
=
15×
÷15×=
9÷
=
1×10%=
（
﹣
）×56=
